For all of our graphic artist friends...
PhotoMugsFast.com accepts TIFF, JPEG, and GIF files in either RGB (red, green, and blue) or CMYK (cyan, magenta, yellow, and black) color modes. You’re able to crop your uploaded artwork, but if you want to design to actual finished sizes:
3.3” x 3.3” (495 x 495 pixels) at 150 dpi resolution.
This size includes a .125” overall bleed.